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#include "project.h"
#define J2(a,b) a ## b
#define J3(a,b,c) a ## b ## c
#define P1 (GPIO4)
#define P1_PORT GPIOE
#define T_BIT 2
#define T_PORT GPIOE
#define T_EXTI_LINE T_BIT
#define M_T(a) J2(GPIO,a)
#define T M_T(T_BIT)
#define M_EXTI_T(a) J2(EXTI,a)
#define EXTI_T M_EXTI_T(T_EXTI_LINE)
#define M_exti_t_isr(a) J3(exti,a,_isr)
#define exti_t_isr M_exti_t_isr(T_EXTI_LINE)
#define M_NVIC_EXTI_T_IRQ(a) J3(NVIC_EXTI,a,_IRQ)
#define NVIC_EXTI_T_IRQ M_NVIC_EXTI_T_IRQ(T_EXTI_LINE)
static Event_ring dcf77_ring;
static EPOCH dcf77_time;
static uint64_t dcf77_last_second;
uint64_t dcf77_last_happy;
static char dcf77_info[40];
void exti_t_isr (void)
{
uint32_t now = HW_CLOCK_REG;
int v;
v = !!gpio_get (T_PORT, T);
nvic_disable_irq (NVIC_EXTI_T_IRQ);
exti_reset_request (EXTI_T);
dcf77_ring.events[dcf77_ring.tx_ptr].when = now;
dcf77_ring.events[dcf77_ring.tx_ptr].ptp = ptp_get();
dcf77_ring.events[dcf77_ring.tx_ptr].value = v;
dcf77_ring.tx_ptr = (dcf77_ring.tx_ptr + 1) & ERING_MASK;
nvic_enable_irq (NVIC_EXTI_T_IRQ);
}
static uint8_t bits[60];
static void process_bits (uint64_t abs, uint64_t ptp)
{
UTC u;
EPOCH e;
if (bits[0]) return;
if (!bits[20]) return;
if (!check_parity (bits, 21, 27, bits[28])) return;
if (!check_parity (bits, 29, 34, bits[35])) return;
if (!check_parity (bits, 36, 57, bits[58])) return;
u.jday = 0;
u.year = le_bcd (bits, 50, 57);
u.month = le_bcd (bits, 45, 49);
u.mday = le_bcd (bits, 36, 41);
u.hour = le_bcd (bits, 29, 34);
u.minute = le_bcd (bits, 21, 27);
u.second = 0;
u.nanosecond = 0;
e = time_utc_to_epoch (u);
e.s -= 3600; /*CET*/
if (bits[17]) e.s -= 3600; /*CEST*/
e.s -= 2; /*Message arrives 2s early*/
dcf77_time = e;
dcf77_last_happy = make_happy (abs, 60);
pll_set_offset (e, abs, ptp);
printf ("DCF77: Next minute is: %02d-%02d-%02d %02d:%02d\r\n", u.year, u.month, u.mday, u.hour, u.minute);
time_print_epoch ("DCF77: ", e, dcf77_info);
dump_bits ("dcf77", bits);
}
static void report_bit (uint64_t abs, uint64_t ptp, int second, int b)
{
if ((second < 0) || (second > 58)) return;
bits[second] = b;
// printf("DCF77: bits[%d]=%d\r\n",second,b);
if (second == 58) process_bits (abs, ptp);
}
void dcf77_dispatch (void)
{
static uint32_t last_0, last_1, last_s;
static int second, bit, had_m;
uint32_t pulse_w, offset ;
static uint64_t abs;
int is_s = 0;
uint32_t now;
uint64_t ptp;
int v;
led2_set (!!gpio_get (T_PORT, T));
if (dcf77_ring.rx_ptr == dcf77_ring.tx_ptr) return;
v = dcf77_ring.events[dcf77_ring.rx_ptr].value;
now = dcf77_ring.events[dcf77_ring.rx_ptr].when;
ptp = dcf77_ring.events[dcf77_ring.rx_ptr].ptp;
//led2_set(v);
dcf77_ring.rx_ptr = (dcf77_ring.rx_ptr + 1) & ERING_MASK;
if (v) {
pulse_w = now - last_0;
pulse_w /= (HW_CLOCK_HZ / 1000);
last_1 = now;
if (pulse_w > 300) {
last_s = now;
is_s = 1;
second++;
dcf77_time.s++;
}
if (pulse_w > 1300) {
had_m = 1;
second = 0;
}
} else {
pulse_w = now - last_1;
pulse_w /= (HW_CLOCK_HZ / 1000);
if (pulse_w > 150)
bit = 1;
else
bit = 0;
sprintf (dcf77_info, "m=%d s=%02d b=%d", had_m, second, bit);
if (had_m)
report_bit (abs, ptp, second, bit);
last_0 = now;
}
offset = now - last_s;
offset /= (HW_CLOCK_HZ / 1000);
if (is_s) {
abs = ref_extend (now);
dcf77_last_second = abs;
pll_dispatch (dcf77_last_happy, abs, ptp, "DCF77");
report_time ("DCF", dcf77_time, abs, dcf77_info);
}
}
void
dcf77_init (void)
{
MAP_INPUT (T);
MAP_OUTPUT_PP (P1);
gpio_set (P1_PORT, P1);
delay_ms (50);
gpio_clear (P1_PORT, P1);
exti_select_source (EXTI_T, T_PORT);
exti_set_trigger (EXTI_T, EXTI_TRIGGER_BOTH);
exti_enable_request (EXTI_T);
nvic_enable_irq (NVIC_EXTI_T_IRQ);
}
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